CN108138603A - The progress control method of combined cycle equipment and combined cycle equipment - Google Patents

The progress control method of combined cycle equipment and combined cycle equipment Download PDF

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Publication number
CN108138603A
CN108138603A CN201680059017.1A CN201680059017A CN108138603A CN 108138603 A CN108138603 A CN 108138603A CN 201680059017 A CN201680059017 A CN 201680059017A CN 108138603 A CN108138603 A CN 108138603A
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CN
China
Prior art keywords
steam
valve
load
turbine
combined cycle
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Granted
Application number
CN201680059017.1A
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Chinese (zh)
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CN108138603B (en
Inventor
洼田充志
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Mitsubishi Power Ltd
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Mitsubishi Hitachi Power Systems Ltd
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Publication of CN108138603A publication Critical patent/CN108138603A/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D17/00—Regulating or controlling by varying flow
    • F01D17/02—Arrangement of sensing elements
    • F01D17/04—Arrangement of sensing elements responsive to load
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K23/00—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids
    • F01K23/02—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled
    • F01K23/06—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle
    • F01K23/10—Plants characterised by more than one engine delivering power external to the plant, the engines being driven by different fluids the engine cycles being thermally coupled combustion heat from one cycle heating the fluid in another cycle with exhaust fluid of one cycle heating the fluid in another cycle
    • F01K23/101—Regulating means specially adapted therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
    • F01K9/003—Plants characterised by condensers arranged or modified to co-operate with the engines condenser cooling circuits
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K9/00—Plants characterised by condensers arranged or modified to co-operate with the engines
    • F01K9/02—Arrangements or modifications of condensate or air pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C6/00—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use
    • F02C6/18—Plural gas-turbine plants; Combinations of gas-turbine plants with other apparatus; Adaptations of gas- turbine plants for special use using the waste heat of gas-turbine plants outside the plants themselves, e.g. gas-turbine power heat plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
    • F02C9/26—Control of fuel supply
    • F02C9/28—Regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02C—GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS
    • F02C9/00—Controlling gas-turbine plants; Controlling fuel supply in air- breathing jet-propulsion plants
    • F02C9/48—Control of fuel supply conjointly with another control of the plant
    • F02C9/50—Control of fuel supply conjointly with another control of the plant with control of working fluid flow
    • F02C9/52—Control of fuel supply conjointly with another control of the plant with control of working fluid flow by bleeding or by-passing the working fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/01—Purpose of the control system
    • F05D2270/05—Purpose of the control system to affect the output of the engine
    • F05D2270/053—Explicitly mentioned power
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/01—Purpose of the control system
    • F05D2270/13—Purpose of the control system to control two or more engines simultaneously
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2270/00—Control
    • F05D2270/30—Control parameters, e.g. input parameters
    • F05D2270/335—Output power or torque
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/18—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
    • F22B1/1807—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines
    • F22B1/1815—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines using the exhaust gases of combustion engines using the exhaust gases of gas-turbines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/16—Combined cycle power plant [CCPP], or combined cycle gas turbine [CCGT]

Abstract

GTCC generating equipments (100) have control unit, control unit makes fuel trim valve (Vd), main steam valve (V1) and by-passing valve (V4) carry out following load reduction and follow operation, i.e., in by-pass operation is closed, when the load reduction request for having input the desired value for reducing GTCC loads, in the state of main steam valve (V1) is opened, reduce the aperture of fuel trim valve (Vd) according to desired value, after the state for being set as by-passing valve (V4) to open, when GTCC loads have reached desired value, the state that by-passing valve (V4) is set as closing.

Description

The progress control method of combined cycle equipment and combined cycle equipment
Technical field
The present invention relates to the progress control methods of a kind of combined cycle equipment and combined cycle equipment.
Background technology
Gas Turbine Combined-cycle (Gas Turbine Combined Cycle：GTCC) generating equipment has combustion gas wheel Machine, recycling generate the heat recovery boiler of steam and by heat recovery boiler from the heat of the exhaust of discharge of gas turbine The steam generated and the steam turbine (for example, referenced patent document 1) rotated.In GTCC generating equipments, pass through combustion gas wheel The rotation of machine and steam turbine, such as generator are driven, and electric energy can be converted to so as to rotate.
Conventional art document
Patent document
Patent document 1：Japanese Unexamined Patent Publication 63-87202 bulletins
Invention content
The invention technical task to be solved
In GTCC generating equipments, when the load for changing equipment entirety, change the load of gas turbine, and follow and change Become the load of steam turbine.That is, if the load of gas turbine changes, the flow and temperature being vented change, therefore The heat exhaust of exhaust changes.If heat exhaust changes, the amount of generated steam becomes in heat recovery boiler It is dynamic.If steam production changes, the quantity of steam for flowing into steam turbine changes, therefore the load of steam turbine occurs It changes.The load of equipment entirety changes as a result,.Therefore, in GTCC generating equipments, for relative to whole load change Gas turbine load tracing ability, the load tracing ability of steam turbine is lower.
The present invention is in view of above-mentioned and complete, and can be improved relative to whole load change its purpose is to provide a kind of The combined cycle equipment of tracing ability of steam turbine and the progress control method of combined cycle equipment.For solving technical task Means
Combined cycle equipment according to the present invention has：Gas turbine has the compressor of compressed air, is supplied from fuel Fuel is supplied to pipeline and is made by the burner of the compressed air burning of the compressor compresses and by the burner Generated burning gases and the turbine rotated, and the fuel trim valve for adjusting fuel feed is set to the fuel feed pipe Road；Heat recovery boiler recycles from the heat of the exhaust of the discharge of gas turbine and generates steam；Steam turbine passes through institute It states the steam generated in heat recovery boiler and rotates；Major steam line, generated in the heat recovery boiler The steam supply to the steam turbine；Main steam valve is set to the major steam line, and adjusts the stream of the steam Flux；Bypass line, from the major steam line branch, and with more being leaned under the flow direction of the steam than the steam turbine Swim side connection；By-passing valve is set to the bypass line, and adjusts the circulation of the steam；And control unit, make the fuel Adjustment valve, the main steam valve and the by-passing valve are run as follows：By-pass operation is closed, the main steam valve is set as opening State, the aperture of the fuel trim valve is set as the target with total load of the gas turbine and the steam turbine It is worth corresponding aperture, the state that the by-passing valve is set as closing；And load reduction follows operation, and by-pass operation is closed described In, when the load reduction for having input the desired value for reducing total load is asked, opening the main steam valve Under state, reduce the aperture of the fuel trim valve according to the desired value, by the by-passing valve be set as the state opened it Afterwards, when total load has reached the desired value, the by-passing valve is set as to the state of closing.
Therefore, when having input load reduction request, a part of steam of major steam line is flowed to from heat recovery boiler Bypass line is flowed to, therefore is supplied to the supply amount reduction of the steam of steam turbine.It in this case, can be with combustion gas wheel The load decline of machine and in heat recovery boiler steam production reduce before, reduce the load of steam turbine.Thereby, it is possible to carry Height relative to the steam turbine of whole load change tracing ability.
In the combined cycle equipment of the present invention, the control unit gradually changes in the load reduction follows operation The aperture of the by-passing valve.
Therefore, by gradually changing the aperture of by-passing valve, can prevent the load of steam turbine becomes unstable.
In the combined cycle equipment of the present invention, the control unit is in the load reduction follows operation, described in reduction The aperture of fuel trim valve, to increase by the way that the by-passing valve is set as the state closed and the load of the steam turbine When, according to the increase of the load of the steam turbine, the load of the gas turbine is reduced.
Total load therefore, it is possible to inhibit gas turbine and steam turbine changes.
The combined cycle equipment of the present invention is also equipped with condenser, and the condenser arrangement than the steam turbine in more leaning on institute The flow direction downstream side of steam is stated, the steam turbine and the bypass line are connect with the condenser.
Therefore, the steam that bypass line is flowed to from heat recovery boiler is condensed by the condenser, therefore can be used as condensed water And it recycles.
The combined cycle equipment of the present invention is also equipped with cooling water supply portion, and the cooling water supply portion will cool down the condensation For the cooling water supply of device to the condenser, the control unit has pump control unit, and the pump control unit makes in the load drop The low amount per unit time for following cooling water of the supply to the condenser in operation is more than to be supplied in described close in by-pass operation To the amount per unit time of the cooling water to the condenser.
Therefore, it is possible to inhibit through the steam supplied from bypass line and the temperature rise of the cooling water in condenser to institute More than the temperature needed, therefore the rising of the outlet temperature of condenser can be inhibited.
In the combined cycle equipment of the present invention, the cooling water supply portion has：1st supply unit closes bypass described Operation and the load reduction follow in operation and supply cooling water to the condenser；And the 2nd supply unit, in the load reduction It follows in operation and supplies cooling water with the 1st supply unit one condenser in the same direction.
Therefore, by using the 2nd supply unit, energy when increasing amount per unit time of the supply to the cooling water of condenser Enough supply amounts for easily adjusting cooling water.
In the combined cycle equipment of the present invention, the control unit makes the fuel trim valve, the main steam valve and institute It states by-passing valve to carry out loading to improve as follows following operation, that is, close in by-pass operation described, when input improves total load The load of desired value when improving request, in the state of the main steam valve is opened, the by-passing valve is set as opening State and wait for it is described load improve request input, input it is described load improve request after, according to the desired value Increase the aperture of the fuel trim valve, the state that the by-passing valve is set as closing.
Therefore, when input load, which improves, asks, make to flow to a part for major steam line from heat recovery boiler in advance Steam flow bypass line when having input load raising request, makes to flow to the steam flow main steam pipe of bypass line originally Road, therefore can effectively increase supply to the supply amount of the steam of steam turbine.It in this case, can be with combustion gas wheel The load increase of machine and in heat recovery boiler before steam production increase, increase the load of steam turbine.Thereby, it is possible to carry Height relative to the steam turbine of whole load change tracing ability.
Also, combined cycle equipment according to the present invention has：Gas turbine, have compressed air compressor, from Fuel feed line supplies fuel and makes by the burner of the compressed air burning of the compressor compresses and by the combustion Generated burning gases in burner and the turbine rotated, and the fuel trim valve for adjusting fuel feed is set to the fuel Feeding pipe；Heat recovery boiler recycles from the heat of the exhaust of the discharge of gas turbine and generates steam；Steam turbine, It is rotated by the steam generated in the heat recovery boiler；Major steam line, will be in the heat recovery boiler The steam generated is supplied to the steam turbine；Main steam valve is set to the major steam line, and adjusts the steaming The circulation of vapour；Bypass line, from the major steam line branch, and the flowing with more leaning on the steam than the steam turbine Direction downstream side connects；By-passing valve is set to the bypass line, and adjusts the circulation of the steam；And control unit, make institute Fuel trim valve, the main steam valve and the by-passing valve is stated to be run as follows：By-pass operation is closed, the main steam valve is set For the state of unlatching, the aperture of the fuel trim valve is set as to total load with the gas turbine and the steam turbine The corresponding aperture of desired value, by the by-passing valve be set as close state；And load improves and follows operation, and side is closed described In logical operation, when the load that input improves the desired value of total load improves request, the main steam is being opened In the state of valve, the by-passing valve is set as the state opened and the load is waited for improve the input asked, described in input Increase the aperture of the fuel trim valve after load raising request according to the desired value, the by-passing valve is set as what is closed State.
Therefore, make to flow to a part of steam flow bypass line of major steam line in advance from heat recovery boiler, when defeated When having entered load raising request, make to flow to the steam flow major steam line of bypass line, therefore can effectively increase originally It supplies to the supply amount of the steam of steam turbine.In this case, it can be returned in the load increase with gas turbine and waste heat In receipts boiler before steam production increase, increase the load of steam turbine.Thereby, it is possible to improve relative to whole load change The tracing ability of dynamic steam turbine.
In the combined cycle equipment of the present invention, the control unit gradually changes in the load improves and follows operation The aperture of the by-passing valve.
Therefore, by gradually changing the aperture of by-passing valve, can prevent the load of steam turbine becomes unstable.
In the combined cycle equipment of the present invention, the control unit is in the load improves and follows operation, described in increase The aperture of fuel trim valve, to be reduced by the way that the by-passing valve is set as the state opened and the load of the steam turbine When, according to the reduction of the load of the steam turbine, the load of the gas turbine increases.
Total load therefore, it is possible to inhibit gas turbine and steam turbine changes.
The combined cycle equipment of the present invention is also equipped with condenser, and the condenser arrangement than the steam turbine in more leaning on institute The flow direction downstream side of steam is stated, the steam turbine and the bypass line are connect with the condenser.
Therefore, the steam that bypass line is flowed to from heat recovery boiler is condensed by the condenser, therefore can be used as condensed water And it recycles.
The combined cycle equipment of the present invention is also equipped with cooling water supply portion, and the cooling water supply portion will cool down the condensation For the cooling water supply of device to the condenser, the control unit has pump control unit, and the pump control unit makes to carry in the load Height is followed to be supplied in operation to the amount per unit time of the cooling water of the condenser to be more than and be supplied in described close in by-pass operation To the amount per unit time of the cooling water to the condenser.
Therefore, it is possible to inhibit through the steam supplied from bypass line and the temperature rise of the cooling water in condenser to institute More than the temperature needed, therefore the rising of the outlet temperature of condenser can be inhibited.
In the combined cycle equipment of the present invention, the cooling water supply portion has：1st supply unit closes bypass fortune described Capable and described load reduction follows in operation and supplies cooling water to the condenser；And the 2nd supply unit, it improves and chases after in the load With in operation, the condenser supplies cooling water in the same direction with the 1st supply unit one.
Therefore, by using the 2nd supply unit, energy when increasing amount per unit time of the supply to the cooling water of condenser Enough supply amounts for easily adjusting cooling water.
Also, in the operation method of combined cycle equipment according to the present invention, the combined cycle equipment has：Combustion gas Turbine has the compressor of compressed air, fuel is supplied from fuel feed line and makes the compression by the compressor compresses The burner of air burning and the turbine rotated by generated burning gases in the burner, and adjust fuel supply The fuel trim valve of amount is set to the fuel feed line；Heat recovery boiler recycles the row from the discharge of gas turbine The heat of gas and generate steam；Steam turbine is rotated by the steam generated in the heat recovery boiler；Main steaming Vapor pipeline supplies the steam generated in the heat recovery boiler to the steam turbine；Main steam valve is set to The major steam line, and adjust the circulation of the steam；Bypass line, from the major steam line branch, and with than institute Steam turbine is stated more to connect by the flow direction downstream side of the steam；And by-passing valve, the bypass line is set to, and adjust The step of circulation of the steam, the progress control method of the combined cycle equipment includes being run as follows：Close bypass Operation, by the main steam valve be set as open state, by the aperture of the fuel trim valve be set as with the gas turbine and The corresponding aperture of desired value of total load of the steam turbine, the state that the by-passing valve is set as closing；And load drop It is low to follow operation, it is closed in by-pass operation described, when input reduces the load reduction request of the desired value of total load, In the state of the main steam valve is opened, reduce the aperture of the fuel trim valve according to the desired value, by the side Port valve is set as after the state opened, and is set as closing by the by-passing valve after total load has reached the desired value State.
Therefore, it is possible to the load decline with gas turbine and in heat recovery boiler steam production reduce before, Reduce the load of steam turbine.Thereby, it is possible to improve the tracing ability of the steam turbine relative to whole load change.
Also, in the operation method of combined cycle equipment according to the present invention, the combined cycle equipment has：Combustion gas Turbine has the compressor of compressed air, fuel is supplied from fuel feed line and makes the compression by the compressor compresses The burner of air burning and the turbine rotated by generated burning gases in the burner, and adjust fuel supply The fuel trim valve of amount is set to the fuel feed line；Heat recovery boiler recycles the row from the discharge of gas turbine The heat of gas and generate steam；Steam turbine is rotated by the steam generated in the heat recovery boiler；Main steaming Vapor pipeline supplies the steam generated in the heat recovery boiler to the steam turbine；Main steam valve is set to The major steam line, and adjust the circulation of the steam；Bypass line, from the major steam line branch, and with than institute Steam turbine is stated more to connect by the flow direction downstream side of the steam；And by-passing valve, the bypass line is set to, and adjust The circulation of the steam；The step of progress control method of the combined cycle equipment includes being run as follows：Close bypass Operation, by the main steam valve be set as open state, by the aperture of the fuel trim valve be set as with the gas turbine and The corresponding aperture of desired value of total load of the steam turbine, the state that the by-passing valve is set as closing；And load carries Height follows operation, is closed in by-pass operation described, when the load raising that input improves the desired value of total load please When asking, in the state of the main steam valve is opened, the by-passing valve is set as the state opened and the load is waited for improve The input of request increases the aperture of the fuel trim valve after inputting the load and improving request according to the desired value, The state that the by-passing valve is set as closing.
Therefore, it is possible in the load increase with gas turbine and in heat recovery boiler before steam production increase, Increase the load of steam turbine.Thereby, it is possible to improve the tracing ability of the steam turbine relative to whole load change.
Invention effect
In accordance with the invention it is possible to provide a kind of tracing ability that can improve the steam turbine relative to whole load change Combined cycle equipment and combined cycle equipment progress control method.
Description of the drawings
Fig. 1 is the figure for an example for representing the GTCC generating equipments involved by the 1st embodiment.
Fig. 2 is the block diagram of an example for the structure for representing the control unit involved by the 1st embodiment.
Fig. 3 is the sequence diagram for the action for representing the GTCC generating equipments involved by the 1st embodiment.
Fig. 4 is the flow chart for the action for representing the GTCC generating equipments involved by the 1st embodiment.
Fig. 5 is the figure for representing to carry out the example for the GTCC generating equipments for closing by-pass operation.
Fig. 6 is the figure for representing to carry out the example for the GTCC generating equipments that load reduction follows operation.
Fig. 7 is to outline the chart that the relationship between the time after request and GTCC loads is reduced from input load.
Fig. 8 is the sequence diagram for the action for representing the GTCC generating equipments involved by the 2nd embodiment.
Fig. 9 is the flow chart for the action for representing the GTCC generating equipments involved by the 2nd embodiment.
Figure 10 is to outline the chart that the relationship between the time after request and GTCC loads is reduced from input load.
Figure 11 is the flow chart for the action for representing the GTCC generating equipments involved by variation.
Specific embodiment
Hereinafter, with reference to the accompanying drawings to the embodiment of Gas Turbine Combined-cycle according to the present invention (GTCC) generating equipment It illustrates.In addition, the present invention is not limited by the embodiment.Also, it is included in the constitutive requirements of following embodiments The important document or substantially the same important document that those skilled in the art can replace and easily replace.
<1st embodiment>
Fig. 1 is the figure for an example for representing the GTCC generating equipments 100 involved by the 1st embodiment.As shown in Figure 1, GTCC Generating equipment 100 have gas turbine 10, heat recovery boiler 20, steam turbine 30, condenser 40, cooling water supply portion 50 and Control unit 60.
Gas turbine 10 has compressor 11, burner 12 and turbine 13.Compressor 11 is introduced from air leading-in conduit road La Air is simultaneously compressed, and makes the compressed air of high temperature and pressure.
Burner 12 supplies fuel to the compressed air supplied from compressor 11 via compressed air feeding pipe Lb and makes It burns.Fuel feed line Ld is connect with burner 12.Fuel feed line Ld supplies fuel to burner 12.Fuel adjusts Valve Vd is set to fuel feed line Ld.Fuel trim valve Vd supplies by adjusting aperture come the fuel adjusted relative to burner 12 To amount.The aperture of fuel trim valve Vd is adjusted by control unit 60.
Turbine 13 by from burner 12 via the burning gases of the burning gases feeding pipe Lc high temperature and pressure supplied and Rotation.Turbine 13 links with rotor 14 and drive shaft 15.Rotor 14 and drive shaft 15 are rotated by the rotation of turbine 13.Driving Axis 15 is connect with generator G1.The rotation of drive shaft 15 can be converted to electric energy and exported by generator G1.Generator G1 will be exported Value (load) is sent to control unit 60.Also, turbine 13 is by the burning gases (exhaust) used in rotation to gas exhaust piping Le Discharge.
Heat recovery boiler 20 is set to gas exhaust piping Le, and carries out heat exchange with flowing through the exhaust of gas exhaust piping Le, and It recycles the heat of exhaust and generates steam.Heat recovery boiler 20 discharges generated steam to major steam line L1.Waste heat Recycling boiler 20 has Waste Heat Recovery portion 21.Waste Heat Recovery portion 21 is heat exchanger, and thermophore (steam) flows through heat-transfer pipe L0's Inside, and carry out heat exchange between the exhaust flowed through outside heat-transfer pipe and the thermophore for flowing through inside.Waste heat about Fig. 1 returns Receipts portion 21 shows 1 heat exchanger, but it is multiple to have economizer (economizer), heater and reheater etc. Heat exchanger.Heat-transfer pipe L0 connection condensate line L3 and major steam line L1.
Steam turbine 30 is connect with major steam line L1.Steam turbine 30 has turbine 31 and rotor 32.Turbine 31 passes through It is rotated from heat recovery boiler 20 via the steam that major steam line L1 is supplied.Rotor 32 is revolved by the rotation of turbine 31 Turn.Rotor 32 is connect with generator G2.The rotation of rotor 32 can be converted to electric energy and exported by generator G2.Generator G2 will be defeated Go out value (load) and be sent to control unit 60.Turbine 31 discharges the steam used in rotation to discharge pipe L2.
Main steam valve V1 is provided in major steam line L1.Main steam valve V1 adjustment is circulated in major steam line L1 The flow of steam.The on-off action of main steam valve V1 is controlled by control unit 60.
Also, bypass line L4 is provided in major steam line L1.Bypass line L4 from major steam line L1 branches, and It is more connect with than steam turbine 30 by the discharge pipe L2 in the flow direction downstream side of steam.Bypass line L4 will be in main steam pipe At least part of the steam to circulate in the L1 of road is supplied around steam turbine 30 to discharge pipe L2.It is set in bypass line L4 It is equipped with by-passing valve V4.The flow of steam that by-passing valve V4 adjustment is circulated in bypass line L4.The on-off action of by-passing valve V4 by Control unit 60 controls.
Condenser 40 is configured at the flow direction downstream side that steam is more leaned on than steam turbine 30, such as connects with discharge pipe L2 It connects.Condenser 40 is condensed from the moisture in the steam that discharge pipe L2 is supplied, and generates condensed water.Condenser 40 will be generated Condensed water is discharged to condensate line L3.Condensate line L3 is connect with above-mentioned heat-transfer pipe L0.Therefore, it is supplied from condensate line L3 The condensed water given circulates in heat-transfer pipe L0.
Cooling water supply portion 50 supplies cooling water to condenser 40.Cooling water supply portion 50 has intake pipe 51 and drainpipe 52.One end of intake pipe 51 is configured at marine, and the other end is connect with condenser 40.The 1st pump 53 is provided in intake pipe 51.The 1 pump 53 draws seawater and it is made to circulate and be supplied to condenser 40 in intake pipe 51.One end of drainpipe 52 and condenser 40 Connection, the other end is configured at marine.Drainpipe 52 makes supply be used for the cooling water cooled down circulation to condenser 40 and return it It returns to marine.
Also, cooling water supply portion 50 has branched pipe 54.Branched pipe 54 is arranged to from intake pipe 51 than the 1st pump 53 more By the part 1 51a branches of the flow direction upstream side of cooling water.Also, branched pipe 54 than the 1st with pumping 53 more in intake pipe 51 By the part 2 51b connections in the flow direction downstream side of cooling water.Therefore, branched pipe 54 by bypass the 1st pump 53 in a manner of with taking Water pipe 51 connects.The 2nd pump 55 is provided in branched pipe 54.2nd pump 55 draws seawater, and make it from intake pipe 51 via the 1st Part 51a and branched pipe 54 and circulate in part 2 51b and intake pipe 51, and supply to condenser 40.
Control unit 60 controls the action in each portion of GTCC generating equipments 100.Fig. 2 is an example for the structure for representing control unit 60 Block diagram.As shown in Fig. 2, control unit 60 has main steam valve control unit 61, by-passing valve control unit 62, fuel trim valve control unit 63 and pump control unit 64.
Main steam valve control unit 61 controls the on-off action of main steam valve V1.By-passing valve control unit 62 controls by-passing valve V4's On-off action.By-passing valve control unit 62 can adjust the aperture of by-passing valve V4.Fuel trim valve control unit 63 controls fuel adjustment The on-off action of valve Vd.Fuel trim valve control unit 63 can adjust the aperture of fuel trim valve Vd.Pump the control of control unit 64 the 1st The action of the 53 and the 2nd pump 55 of pump.Pump control unit 64 can individually control the action of the 1st pump 53 and the action of the 2nd pump 55.
Then, the action of GTCC generating equipments 100 as constituted above is illustrated.Fig. 3 is to represent that GTCC power generations are set The sequence diagram of standby 100 action.The horizontal axis of Fig. 3 represents the moment.Fig. 4 is the flow chart for the action for representing GTCC generating equipments 100. Fig. 4 is the figure for the action for illustrating each portion shown in Fig. 3 in order.Hereinafter, according to Fig. 3 and Fig. 4 to the dynamic of GTCC generating equipments 100 It illustrates.
First, control unit 60 starts gas turbine 10.In gas turbine 10,11 compressed air of compressor, in burner 12 Compressed air is burned with fuel, is rotated by burning gases and turbine 13.Generator G1 is started by the rotation of turbine 13 Power generation, and output valve is sent to control unit 60.
In the action, control unit 60 adjusts the aperture (step S10) of fuel trim valve Vd according to desired value.For example, work as When GTCC generating equipments 100 carry out constant load operation, control unit 60 is with total load of gas turbine 10 and steam turbine 30 The desired value of (hereinafter, labeled as " GTCC loads ") is set as 100% mode.Then, control unit 60 is born with GTCC The mode carried as 100% adjusts the aperture of fuel trim valve Vd.In addition, about desired value and fuel trim valve Vd aperture it Between relationship, can be obtained in advance, and be stored in control unit 60 as tables of data.
Also, in control unit 60, main steam valve V1 is set as open state (step S20) by main steam valve control unit 61, other By-passing valve V4 is set as closed state (step S30) by port valve control unit 62.Pass through step S20 and step S30, major steam line L1 It is opened, bypass line L4 is closed.
Also, in control unit 60, pump control unit 64 starts the 1st pump 53, and supplies cooling water (step to condenser 40 S40).In this way, in step S10 to step S40, control unit 60 is closed by-pass operation as follows, that is, is set as main steam valve V1 By the corresponding aperture of the aperture of fuel trim valve Vd is set as with GTCC is loaded desired value, by-passing valve V4 is set for the state of unlatching State for closing.In addition, about from step S20 to the action of step S40, control unit 60 can carry out institute identical at the time of There is action, at least one can also be acted and carried out at different times.
In gas turbine 10, turbine 13 discharges exhaust G to gas exhaust piping Le.Exhaust G is supplied via gas exhaust piping Le to useless Thimble-tube boiler 20.Heat recovery boiler 20, which is absorbed from the heat extraction of exhaust G that gas exhaust piping Le is supplied, generates steam S1.Fig. 5 It is the figure for representing to carry out the example for the GTCC generating equipments 100 for closing by-pass operation.As shown in figure 5, in by-pass operation is closed, bypass Valve V4 becomes closed state, and bypass line L4 is closed.Therefore, the steam S1 generated in heat recovery boiler 20 does not flow through side Siphunculus road L4, and supplied via major steam line L1 to steam turbine 30.
In steam turbine 30, rotated by the steam S1 supplied from heat recovery boiler 20 and turbine 31.Generator G2 leads to It crosses the rotation of turbine 31 and starts to generate electricity, and output valve is sent to control unit 60.Used in the discharge rotation of steam turbine 30 Steam S2, and supplied via discharge pipe L2 to condenser 40.Condenser 40 condense the moisture in supplied steam S2 and Condensed water W is generated, and is supplied via condensate line L3 to heat recovery boiler 20.Cooling water supply portion 50 passes through the 1st pump 53 Cooling water R is supplied to condenser 40, thus cools down condenser 40.The cooling water R for cooling condenser 40 is discharged from drainpipe 52 To marine.
In this way, by the action of gas turbine 10, generator G1 generates electricity, and passes through the action of steam turbine 30, power generation Machine G2 generates electricity.When GTCC loads have reached desired value i.e. 100%, GTCC generating equipments 100 run as constant load (moment t1).
Then, control unit 60 detects whether that having input the load reduction for reducing the desired value that GTCC is loaded from 100% asks It asks (step S50).Load reduction request reduces GTCC power generations such as when the situation that demand reduction has occurred in electric system It is entered during the GTCC loads of equipment 100.
When the input for detecting load reduction request ("Yes" of step S50, moment t2), control unit 60 loads GTCC The fresh target value in load reduction request is followed, therefore carries out load reduction and follows operation.Hereinafter, GTCC is loaded with having input Desired value be reduced to 80% load reduction request in case of son, operation is followed to load reduction and is specifically described.
It pumps control unit 64 and starts the 2nd 55 (step S60) of pump.Started by the 2nd pump 55, the seawater being drawn is from intake pipe 51 Part 1 51a and branched pipe 54 are flowed through, and flows through part 2 51b and intake pipe 51, and is supplied to condenser 40.Therefore, it is cold Condenser 40 is cooled down by the cooling water R by 53 supply of the 1st pump and by the cooling water R of 55 supply of the 2nd pump.Therefore, with only starting The situation of 1st pump 53 is compared, and the quantitative change for cooling down the cooling water R per unit time of condenser 40 is more.When by-passing valve V4 is opens shape During state, supplied not via the steam S1 of steam turbine 30 to condenser 40.Steam S1 and the steam via steam turbine 30 S2, which is compared, has more thermal energy.It is supplied in condenser 40 and cooling water R, therefore inhibit by the 53 and the 2nd pump 55 of the 1st pump It is more than the temperature rise to required temperature of the cooling water R in condenser 40, and inhibit the outlet temperature of condenser 40 Rise.
Also, fuel trim valve control unit 63 asked according to load reduction in fresh target value, reduce fuel trim valve Vd Aperture (step S70).That is, fuel trim valve control unit 63 reduces the fuel feed relative to burner 12, therefore reduce The aperture of fuel trim valve Vd.At this point, fuel trim valve control unit 63 with time going by and side that aperture is gradually reduced The aperture of formula control fuel trim valve Vd.
Also, by-passing valve V4 is changed to open state (step S70) by by-passing valve control unit 62.In addition, in present embodiment In, the action that by-passing valve V4 is changed to open state by by-passing valve control unit 62 is used as with above-mentioned through fuel trim valve control Portion 63 processed reduces the action that the action of the aperture of fuel trim valve Vd carries out side by side, and is illustrated in identical step S70, But it's not limited to that, such as can also first carry out any of which.Fig. 6 is to represent to carry out the GTCC that load reduction follows operation The figure of the example of generating equipment 100.As shown in fig. 6, by the way that by-passing valve V4 is set as open state, bypass line L4 is opened, main Steam pipework L1 is connect with discharge pipe L2.Therefore, a part of steam S1 of major steam line L1 is flowed through via bypass line L4 Discharge pipe L2 is transported to, and is supplied to condenser 40.
In step S70, by-passing valve control unit 62 gradually increases the aperture of by-passing valve V4 with time going by.Example Such as, as shown in figure 3, by-passing valve control unit 62 increases the aperture of by-passing valve V4 at a constant ratio.Also, by-passing valve control unit 62 Such as the adjustment increased speed of aperture, so as to the aperture of by-passing valve V4 the time point (moment before reaching desired value is loaded in GTCC T3) as full-gear.When the aperture of by-passing valve V4 becomes full-gear, tieed up after by-passing valve control unit 62 with full-gear Hold the aperture of by-passing valve V4.
By-passing valve V4 is changed to open state by GTCC generating equipments 100, so as to up to the present from heat recovery boiler 20 A part of steam S1 for flowing to major steam line L1 flows to bypass line L4.Therefore, it supplies to the steam S1's of steam turbine 30 Supply amount is reduced.From the time being changed to by-passing valve V4 until open state plays the steam delivery volume reduction to steam turbine 30 Time until being reduced earlier than the steam production in heat recovery boiler 20 with the load decline of gas turbine 10.Cause This, the load of steam turbine 30 efficiently reduces.
Then, control unit 60 detects whether GTCC loads have reached desired value (step S80), and GTCC loads reach desired value Until continue above-mentioned operation ("No" of step S80).When detect GTCC load reached desired value when (step S80's "Yes", moment t4), by-passing valve V4 is changed to closed state (step S90) by by-passing valve control unit 62.
In this step, by-passing valve control unit 62 is gradually reduced the aperture of by-passing valve V4 with time going by.For example, As shown in figure 3, by-passing valve control unit 62 reduces the aperture of by-passing valve V4 at a constant ratio.When the aperture of by-passing valve V4 becomes complete During closed state (moment t5), the aperture of by-passing valve V4 is maintained after by-passing valve control unit 62 with full-shut position.
Also, when the aperture for reducing by-passing valve V4, the steam S1 of bypass line L4 is up to the present flowed through as flowing through Major steam line L1.Therefore, it supplies to the amount increase of the steam S1 of steam turbine 30, the load of steam turbine 30 increases.Then, Fuel trim valve control unit 63 reduces the aperture (step S90) of fuel trim valve Vd.In addition, in the present embodiment, pass through combustion Material adjustment valve control unit 63 reduces the action of the aperture of fuel trim valve Vd as to pass through by-passing valve control unit 62 with above-mentioned By-passing valve V4 is changed to the action that the action of closed state carries out side by side, and is illustrated in identical step S90, but not This is defined in, such as can also first carry out any of which.In this step, the aperture of fuel trim valve Vd reduces, therefore fires The load of gas-turbine 10 is reduced.Increasing relative to the load of steam turbine 30, control unit 60 reduces the load of gas turbine 10, by The variation of this control GTCC loads.
In figure 3, enumerated as an example by the aperture of fuel trim valve Vd moment t5 become steady state value in a manner of into The situation of row control.When carrying out the control, increased steam turbine 30 when by-passing valve V4 is set as closed state by advance budgetary estimate Load calculates the aperture of fuel trim valve Vd corresponding with estimate.Then, the aperture for being gradually reduced fuel trim valve Vd is straight To as calculated value.In addition, the control of the aperture about fuel trim valve Vd, is not limited to aforesaid way.For example, combustion Material adjustment valve control unit 63 can also detect the load of gas turbine 10 and steam turbine 30 on one side, loaded adjust according to GTCC on one side The aperture of whole fuel trim valve Vd.In this case, the aperture of fuel trim valve Vd can also be continued after moment t5 Adjustment.
Also, if by-passing valve V4 becomes full-shut position, and bypass line L4 is closed, therefore from major steam line L1's Steam S1 will not be supplied in condenser 40.Therefore, it is reduced using the 2nd pump 55 to supply the necessity of cooling water R.Therefore, When by-passing valve V4 becomes full-shut position, pump control unit 64 stops the action (step S100, moment t5) of the 2nd pump 55.Stopping When the input of load reduction request is not detected after the action of the 2nd pump 55 or in step s 50 ("No" of step S50), inspection The action whether survey has input GTCC equipment 100 terminates order (step S110), upon this detection, tenth skill (step S110 "Yes").Also, when action is not detected and terminates order ("No" of step S110), repeat dynamic after step S50 Make.In this way, control unit 60, which carries out load reduction, follows operation.
As more than, when having input load reduction request, the GTCC generating equipments 100 involved by present embodiment are loading Reduction is followed in operation, and a part of steam S1 for flowing to major steam line L1 from heat recovery boiler 20 is made to flow to bypass line L4.Therefore, it supplies to the supply amount reduction of the steam S1 of steam turbine 30.It is asked as a result, for load reduction, it can be effectively The load of steam turbine 30 is reduced, therefore the load tracing ability of steam turbine 30 can be improved.
Fig. 7 is to outline the chart that the relationship between the time after request and GTCC loads is reduced from input load.Fig. 7 Horizontal axis for the moment, the longitudinal axis represents the value of GTCC loads.Also, the expression of block curve 102 of Fig. 7 has carried out present embodiment Load reduction follows relationship during operation.Also, the single dotted broken line curve 104 of Fig. 7 represents that not carrying out load reduction follows operation And the relationship when reducing the aperture of fuel trim valve Vd in the state of closing bypass line L4.The t2 at the time of horizontal axis of Fig. 7 And t4 with Fig. 3 at the time of t2 and t4 it is corresponding.
As shown in fig. 7, GTCC generating equipments 100 are followed by carrying out load reduction, until GTCC loads reach desired value Until time for example shorten Δ ta.Therefore, GTCC generating equipments 100 can improve the tracing ability of GCTT loads.The time Δ Change speed the etc. during aperture for increasing speed and changing fuel trim valve Vd when ta is according to the aperture for increasing by-passing valve V4 and It changes.
Also, in the present embodiment, when the aperture for adjusting fuel trim valve Vd, fuel trim valve control unit 63 uses It is gradually reduced the mode of aperture with time going by.Also, when the open and-shut mode for switching by-passing valve V4, by-passing valve control Portion 62 by the way of aperture is changed with time going by and gradually.Thereby, it is possible to inhibit gas turbine 10 and steam turbine 30 load sharp changes, therefore can inhibit the decline of power quality.
<2nd embodiment>
Then, the 2nd embodiment is illustrated.In the 2nd embodiment, to when in GTCC generating equipments 100 into When row closes by-pass operation, the action when load that input improves GTCC loads improves request illustrates.Load improves request example The situation of increase in demand is such as expected in electric system and is entered when increasing GTCC loads.
Fig. 8 is the sequence diagram for the action for representing GTCC generating equipments 100.The horizontal axis of Fig. 8 represents the moment.
Fig. 9 is the flow chart for the action for representing GTCC generating equipments 100.Fig. 9 is to illustrate each portion shown in Fig. 8 in order The figure of action.Hereinafter, the action of GTCC generating equipments 100 is illustrated according to Fig. 8 and Fig. 9.In addition, in the 2nd embodiment In, son illustrates in case of input load improves the predetermined instant (such as Fig. 8 at the time of t8) asked clearly.
Control unit 60 is closed by-pass operation as follows, that is, the state for being set as opening by main steam valve V1, by fuel trim valve The corresponding aperture of the aperture of Vd is set as with GTCC is loaded desired value, the state that by-passing valve V4 is set as closing.In the 2nd embodiment party In formula, control unit 60 for example sets opening for fuel trim valve Vd in a manner that GTCC generating equipments 100 become GTCC loads 80% Degree.In addition, example during desired value of the 2nd embodiment to improve GTCC loads from the state for closing by-pass operation, therefore close side The desired value of logical running GTCC loads is less than 100%.
In this state, when as input predetermined moment t8 early stipulated time that request is improved than load at the time of during t6, Control unit 60 makes GTCC loads follow the fresh target value in load raising request, therefore load improving and follow operation.In addition, About above-mentioned stipulated time (from moment t6 to the time of moment t8), can preset.Hereinafter, loaded GTCC with input Desired value is improved improve request to 100% load in case of son, load is improved and follows operation and is specifically described.
By-passing valve V4 is changed to open state (step S210) by by-passing valve control unit 62.By the way that by-passing valve V4 is set as out shape State, bypass line L4 are opened, and major steam line L1 is connect with discharge pipe L2.Therefore, one of major steam line L1 is flowed through Steam S1 is divided to be delivered to discharge pipe L2 via bypass line L4, and is supplied to condenser 40.
In step S210, by-passing valve control unit 62 gradually increases the aperture of by-passing valve V4 with time going by.Example Such as, as shown in figure 8, by-passing valve control unit 62 increases the aperture of by-passing valve V4 at a constant ratio.Also, by-passing valve control unit 62 Such as the adjustment increased speed of aperture, so as to the aperture of by-passing valve V4 the time point (moment t7) before asking is improved in input load As full-gear.When the aperture of by-passing valve V4 becomes full-gear, maintained after by-passing valve control unit 62 with full-gear The aperture of by-passing valve V4.
Also, when opening by-passing valve V4, a part of steam S1 for up to the present flowing through major steam line L1 becomes stream Through bypass line L4.Therefore, it supplies to the amount reduction of the steam S1 of steam turbine 30, the load of steam turbine 30 is reduced.Then, Fuel trim valve control unit 63 is adjusted (step S220) in a manner that the aperture of fuel trim valve Vd is increased.In step S220 In, the aperture of fuel trim valve Vd increases, therefore the load of gas turbine 10 increases.Load relative to steam turbine 30 subtracts Few, control unit 60 increases the load of gas turbine 10, thus inhibits the variation of GTCC loads.
In fig. 8, it has enumerated and has been carried out in a manner that the aperture of fuel trim valve Vd is increased at a constant ratio as an example The situation of control, but it's not limited to that.For example, fuel trim valve control unit 63 can also detect gas turbine 10 and steam on one side The load of steam turbine 30, on one side according to the aperture of GTCC adjustment of load fuel trim valves Vd.It in this case, can also basis GTCC loads and increases or decreases the aperture of fuel trim valve Vd.
Also, it pumps control unit 64 and starts the 2nd 55 (step S230) of pump.Started by the 2nd pump 55, the seawater being drawn is from taking Water pipe 51 flows to part 1 51a and branched pipe 54, and flows through part 2 51b and intake pipe 51 and supply to condenser 40.It is logical Cross the 1st pump the 53 and the 2nd pump 55 and cooling water R is supplied in condenser 40, therefore inhibit condenser 40 in cooling water R temperature Degree rises to more than required temperature, and inhibit the rising of the outlet temperature of condenser 40.
In this state, control unit 60 detects the presence of the input (step S240) that load improves request, and waits for until having Load improves the input ("No" of step S240) of request.When have load improve request input when ("Yes" of step S240), Fuel trim valve control unit 63 improves the fresh target value in request according to load, increases the aperture (step of fuel trim valve Vd S250).In this step, fuel trim valve control unit 63 to control combustion with time going by and in a manner of aperture gradually increases The aperture of material adjustment valve Vd.
Also, after improving the input time t8 of request even across load, by-passing valve control unit 62 is also by by-passing valve V4 is maintained open state, and by-passing valve V4 is changed to closed state (step S250) by t9 at the time of after the stipulated time.Separately Outside, by-passing valve V4 is maintained the time of open state i.e. from moment t8 to moment t9's about after the input that request is improved in load Time can preset, such as can also be calculated by control unit 60 according to the GTCC values loaded.In addition, in this implementation In mode, the action that by-passing valve V4 is changed to closed state by by-passing valve control unit 62 is used as and is adjusted with above-mentioned by fuel Valve control unit 63 increases the action that the action of the aperture of fuel trim valve Vd carries out side by side, and is carried out in identical step S250 Illustrate, but it's not limited to that, such as can also first carry out any of which.In this step, by-passing valve control unit 62 with The process of time and the aperture for being gradually reduced by-passing valve V4.For example, as shown in figure 8, by-passing valve control unit 62 at a constant ratio Reduce the aperture of by-passing valve V4.When the aperture of by-passing valve V4 becomes full-shut position (moment t10), after by-passing valve control unit 62 The aperture of by-passing valve V4 is maintained with full-shut position.
GTCC generating equipments 100 cut off the stream of the steam S1 in bypass line L4 by the way that by-passing valve V4 is set as closed state Dynamic, the steam S1 from heat recovery boiler 20 flows to major steam line L1.Therefore, it supplies to the steam S1's of steam turbine 30 Supply amount increases.From the time being changed to by-passing valve V4 until closed state plays the steam delivery volume increase to steam turbine 30 Time until increasing earlier than the steam production in heat recovery boiler 20 with the load increase of gas turbine 10.Cause This, the load of steam turbine 30 effectively increases.
In addition, in fig. 8, enumerated as an example by-passing valve V4 as full-shut position at the time of, by fuel trim valve Vd Aperture unanimous circumstances in moment t10 at the time of be set as constant and at the time of GTCC loads reach desired value (100%), but It's not limited to that.Wherein any time can be before or after moment t10.
Also, when by-passing valve V4 becomes full-shut position, pump control unit 64 stops the action of the 2nd pump 55 (when step S260, Carve t10).In this way, control unit 60, which carries out load raising, follows operation.
As more than, the GTCC generating equipments 100 involved by present embodiment, which make to flow to from heat recovery boiler 20 in advance, to be led A part of steam S1 of steam pipework L1 flows to bypass line L4, when having input load raising request, makes to flow to bypass originally The steam S1 of pipeline L4 flows to major steam line L1, therefore can effectively increase confession of the supply to the steam S1 of steam turbine 30 To amount.In this case, can the load increase with gas turbine 10 and in heat recovery boiler 20 steam production increase In addition before, increase the load of steam turbine 30.Thereby, it is possible to improve the load tracing ability of steam turbine 30.
Figure 10 is to outline the chart that the relationship between the time after request and GTCC loads is improved from input load.Figure 10 horizontal axis is the moment, and the longitudinal axis represents the value of GTCC loads.Also, the expression of block curve 106 of Figure 10 carry out this embodiment party The load of formula improves relationship when following operation.Also, the single dotted broken line curve 108 of Fig. 7 represents that not carrying out load raising follows It runs and the relationship when increasing the aperture of fuel trim valve Vd in the state of closing bypass line L4.The horizontal axis of Figure 10 when T8 and t10 is corresponding at the time of t8 and t10 is carved with Fig. 8.
As shown in Figure 10, GTCC generating equipments 100 are followed by carrying out load raising, until GTCC loads reach desired value Until time for example shorten Δ tb.Therefore, GTCC generating equipments 100 can improve the tracing ability of GCTT loads.The time Δ Reductions speed when tb is according to the aperture for reducing by-passing valve V4 and change speed when changing the aperture of fuel trim valve Vd etc. and It changes.
The technical scope of the present invention is not limited to the above embodiment, and without departing from the spirit and scope of the present invention can It is suitably changed.For example, it in the above-described embodiment, carries out load reduction respectively with GTCC generating equipments 100 and follows operation And load dynamic being illustrated as an example, but it's not limited to that or is able to carry out bearing of improving when following operation It carries to reduce to follow operation and load to improve and follows both operations.
Figure 11 is the flow chart of the flow for the action for representing the GTCC generating equipments 100 involved by variation.Hereinafter, with reference to Figure 11 carries out GTCC generating equipments 100 action that load reduction is followed operation and loaded when both operations are followed in raising and carries out Explanation.As shown in figure 11, control unit 60 is closed by-pass operation as follows, that is, the state for being set as opening by main steam valve V1 will fire The aperture of material adjustment valve Vd is set as aperture corresponding with the desired value that GTCC is loaded, and by-passing valve V4 is set as the state closed (step Rapid S310).In step S310, GTCC generating equipments 100 for example carry out the slave step S10 to step S40 in the 1st embodiment Action as closing by-pass operation.
Then, control unit 60 detects whether to have input the load reduction request (step for the desired value for reducing GTCC loads S320).When the input for detecting load reduction request ("Yes" of step S320), control unit 60 makes GTCC loads follow load The fresh target value in request is reduced, therefore carries out load reduction and follows operation (step S330).In step S330, GTCC power generations The action that equipment 100 for example carries out the slave step S60 to step S100 in the 1st embodiment follows operation as load reduction.
When the input that load reduction request is not detected ("No" of step S320), control unit 60 detects the presence of input and carries The load of the desired value of high GTCC loads improves predetermined (the step S340) of request.When the input for detecting load raising request When predetermined ("Yes" of step S340), control unit 60 makes GTCC loads follow fresh target value when having input load and improving request, Therefore it carries out load raising and follows operation (step S350).In step S350, it is real that GTCC generating equipments 100 for example carry out the 2nd The action for applying the slave step S210 to step S260 in mode follows operation as load raising.
It is carrying out after load reduction follows operation, and is carrying out load and improve following after operation or ought not detecting When the input asked to load raising is predetermined ("No" of step S340), control unit 60 judges whether to terminate GTCC generating equipments 100 action (step S360).When being judged as tenth skill ("Yes" of step S360), GTCC generating equipments 100 are according to sentencing The disconnected action for terminating GTCC generating equipments 100.When being judged as continuing action ("No" of step S360), GTCC power generations are set Standby 100 repeat the action after step S320.
Even if as a result, in the case of any one during input load reduces request and load raising request, GTCC power generations Equipment 100 also can effectively increase and decrease the load of steam turbine 30.Thereby, it is possible to improve the load tracing ability of steam turbine.
Also, in the above-described embodiment, it is illustrated using the structure for being provided with 1 steam turbine 30 as example, but It's not limited to that or is provided with the structure of multistage steam turbine 30.Also, when setting multistage steam turbine 30, The end of downstream side of bypass line L4 can be connected between on high-tension side steam turbine and the steam turbine of low-pressure side.
Also, in the above-described embodiment, operation is followed in load reduction and load is improved in following operation, with control unit 60 at a constant ratio change by-passing valve V4 and fuel trim valve Vd aperture in case of son be illustrated, but and unlimited Due to this.For example, control unit 60 can also periodically change the aperture of by-passing valve V4 and fuel trim valve Vd.Also, it controls Portion 60 can also make the ratio of the variation of the aperture of by-passing valve V4 and fuel trim valve Vd become larger or taper into.
Also, in the above-described embodiment, with load reduction follow operation in by close by-passing valve V4 increase steam During the load of steam turbine 30, in order to inhibit the variation that GTCC loads and son carries out in case of reducing the load of gas turbine 10 Explanation, but it's not limited to that.For example, as long as the variation of GTCC loads can not also then reduce combustion gas in permissible range The load of turbine 10.
Similarly, with load improve follow operation in reduce the load of steam turbine 30 by opening by-passing valve V4 When, in order to inhibit the variation that GTCC loads and son is illustrated in case of increasing the load of gas turbine 10, but as long as The variation of GTCC loads can not also then increase the load of gas turbine 10 in permissible range.
Also, in the above-described embodiment, in cooling water supply portion 50, drawn by the 53 and the 2nd pump 55 of the 1st pump Son is illustrated, but not in case of cooling water converges in the part 2 51b of intake pipe 51 and supplies to condenser 40 It is defined in this.For example, it can be the cooling water drawn by the 1st pump 53 and the cooling water drawn by the 2nd pump 55 with difference Path supply to the structure of condenser 40.
Symbol description
G- is vented, G1, G2- generator, La- air leading-in conduits road, Lb- compressed air feeding pipes, and Lc- burning gases supply To pipeline, Ld- fuel feed lines, Le- gas exhaust pipings, L0- heat-transfer pipes, L1- major steam lines, L2- discharge pipes, L3- is cold Condensate line, L4- bypass lines, R- cooling waters, S1, S2- steam, t1, t2, t3, t4, t5, t6, t7, t8, t9- moment, Vd- Fuel trim valve, V1- main steam valves, V4- by-passing valves, W- condensed waters, 10- gas turbines, 11- compressors, 12- burners, 13, 31- turbines, 14,32- rotors, 15- drive shafts, 20- heat recovery boilers, 21- Waste Heat Recoveries portion, 30- steam turbines, 40- is cold Condenser, 50- cooling water supplies portion, 51- intake pipes, 51a- part 1s, 51b- part 2s, 52- drainpipes, 53- the 1st are pumped, 54- Branched pipe, 55- the 2nd are pumped, 60- control units, 61- main steam valve control units, 62- by-passing valve control units, the control of 63- fuel trim valves Portion, 64- pump control unit, 100-GTCC generating equipments, 102,104,106,108- curves.

Claims (15)

1. a kind of combined cycle equipment, has：
Gas turbine has the compressor of compressed air, supplies fuel from fuel feed line and make through the compressor pressure The burner of the compressed air burning of contracting and the turbine rotated by generated burning gases in the burner, and adjust The fuel trim valve of fuel feed is set to the fuel feed line；
Heat recovery boiler recycles from the heat of the exhaust of the discharge of gas turbine and generates steam；
Steam turbine is rotated by the steam generated in the heat recovery boiler；
Major steam line supplies the steam generated in the heat recovery boiler to the steam turbine；
Main steam valve is set to the major steam line, and adjusts the circulation of the steam；
Bypass line, from the major steam line branch, and with more being leaned under the flow direction of the steam than the steam turbine Swim side connection；
By-passing valve is set to the bypass line, and adjusts the circulation of the steam；And
Control unit makes the fuel trim valve, the main steam valve and the by-passing valve be run as follows：Close by-pass operation, The state that the main steam valve is set as opening, the aperture of the fuel trim valve is set as and the gas turbine and the steaming The corresponding aperture of desired value of total load of steam turbine, the state that the by-passing valve is set as closing；And load reduction chases after It with operation, is closed in by-pass operation described, when the load reduction for having input the desired value for reducing total load is asked When, in the state of the main steam valve is opened, reduce the aperture of the fuel trim valve according to the desired value, by described in By-passing valve is set as after the state opened, and when total load has reached the desired value, the by-passing valve is set to off The state closed.
2. combined cycle equipment according to claim 1, wherein,
The control unit gradually changes the aperture of the by-passing valve in the load reduction follows operation.
3. combined cycle equipment according to claim 1 or 2, wherein,
The control unit reduces the aperture of the fuel trim valve in the load reduction follows operation, so as to pass through by The by-passing valve be set as the state closed and during the load increase of the steam turbine, according to the increasing of the load of the steam turbine Add and the load of gas turbine reduction.
4. combined cycle equipment according to any one of claim 1 to 3, wherein,
The combined cycle equipment is also equipped with condenser, the condenser arrangement in than the steam turbine more by the steam Flow direction downstream side,
The steam turbine and the bypass line are connect with the condenser.
5. combined cycle equipment according to claim 4, wherein,
The combined cycle equipment is also equipped with cooling water supply portion, the cooling that the cooling water supply portion will cool down the condenser Water is supplied to the condenser,
The control unit has pump control unit, and the pump control unit makes to supply to described cold in the load reduction follows operation The amount per unit time of the cooling water of condenser, which is more than, to be supplied in described close in by-pass operation to the cooling water of the condenser Amount per unit time.
6. combined cycle equipment according to claim 5, wherein,
The cooling water supply portion has：
1st supply unit closes by-pass operation and the load reduction follows in operation and supplies cooling water to the condenser described； And
2nd supply unit, the condenser supply cools down in the same direction with the 1st supply unit one in the load reduction follows operation Water.
7. combined cycle equipment according to any one of claim 1 to 6, wherein,
The control unit makes the fuel trim valve, the main steam valve and the by-passing valve carry out loading to improve as follows following fortune Row, that is, it is closed in by-pass operation described, when the load that input improves the desired value of total load improves request, In the state of the main steam valve is opened, the by-passing valve is set as the state opened and the load is waited for improve request Input increases the aperture of the fuel trim valve, by described in after the input load improves request according to the desired value By-passing valve is set as the state closed.
8. a kind of combined cycle equipment, has：
Gas turbine；Compressor with compressed air supplies fuel from fuel feed line and makes through the compressor pressure The burner of the compressed air burning of contracting and the turbine rotated by generated burning gases in the burner, and adjust The fuel trim valve of fuel feed is set to the fuel feed line；
Heat recovery boiler recycles from the heat of the exhaust of the discharge of gas turbine and generates steam；
Steam turbine is rotated by the steam generated in the heat recovery boiler；
Major steam line supplies the steam generated in the heat recovery boiler to the steam turbine；
Main steam valve is set to the major steam line, and adjusts the circulation of the steam；
Bypass line, from the major steam line branch, and with more being leaned under the flow direction of the steam than the steam turbine Swim side connection；
By-passing valve is set to the bypass line, and adjusts the circulation of the steam；And
Control unit makes the fuel trim valve, the main steam valve and the by-passing valve be run as follows：Close by-pass operation, The state that the main steam valve is set as opening, the aperture of the fuel trim valve is set as and the gas turbine and the steaming The corresponding aperture of desired value of total load of steam turbine, the state that the by-passing valve is set as closing；And load is improved and is chased after With operation, closed in by-pass operation described, when the load that input improves the desired value of total load improves request, In the state of the main steam valve is opened, the by-passing valve is set as the state opened and the load is waited for improve request Input increases the aperture of the fuel trim valve, by described in after the input load improves request according to the desired value By-passing valve is set as the state closed.
9. combined cycle equipment according to claim 7 or 8, wherein,
The control unit gradually changes the aperture of the by-passing valve in the load improves and follows operation.
10. the combined cycle equipment according to any one of claim 7 to 9, wherein,
The control unit improves in the load and follows operation, increases the aperture of the fuel trim valve, so as to pass through by The by-passing valve be set as open state and the steam turbine load reduce when, according to subtracting for the load of the steam turbine The load of the gas turbine increases less.
11. the combined cycle equipment according to any one of claim 8 to 10, wherein,
The combined cycle equipment is also equipped with condenser, the condenser arrangement in than the steam turbine more by the steam Flow direction downstream side,
The steam turbine and the bypass line are connect with the condenser.
12. combined cycle equipment according to claim 11, wherein,
The combined cycle equipment is also equipped with cooling water supply portion, the cooling that the cooling water supply portion will cool down the condenser Water is supplied to the condenser,
The control unit, which has, pumps control unit, and the pump control unit makes to supply to described cold in operation is followed in the load raising The amount per unit time of the cooling water of condenser, which is more than, to be supplied in described close in by-pass operation to the cooling water of the condenser Amount per unit time.
13. combined cycle equipment according to claim 12, wherein,
The cooling water supply portion has：
1st supply unit closes by-pass operation and the load reduction follows in operation and supplies cooling water to the condenser described； And
2nd supply unit, the condenser supply cools down in the same direction with the 1st supply unit one in operation is followed in the load raising Water.
14. a kind of progress control method of combined cycle equipment, the combined cycle equipment have：
Gas turbine has the compressor of compressed air, supplies fuel from fuel feed line and make through the compressor pressure The burner of the compressed air burning of contracting and the turbine rotated by generated burning gases in the burner, and adjust The fuel trim valve of fuel feed is set to the fuel feed line；
Heat recovery boiler recycles from the heat of the exhaust of the discharge of gas turbine and generates steam；
Steam turbine is rotated by the steam generated in the heat recovery boiler；
Major steam line supplies the steam generated in the heat recovery boiler to the steam turbine；
Main steam valve is set to the major steam line, and adjusts the circulation of the steam；
Bypass line, from the major steam line branch, and with more being leaned under the flow direction of the steam than the steam turbine Swim side connection；And
By-passing valve is set to the bypass line, and adjusts the circulation of the steam,
The step of progress control method of the combined cycle equipment includes being run as follows：
Close by-pass operation, by the main steam valve be set as open state, by the aperture of the fuel trim valve be set as with it is described The corresponding aperture of desired value of total load of gas turbine and the steam turbine, the shape that the by-passing valve is set as closing State；And
Load reduction follows operation, is closed in by-pass operation described, when having input the negative of the desired value that reduces total load When carrying reduction request, in the state of the main steam valve is opened, opening for the fuel trim valve is reduced according to the desired value Degree, after the state for being set as the by-passing valve to open, after total load has reached the desired value by described in By-passing valve is set as the state closed.
15. a kind of progress control method of combined cycle equipment, the combined cycle equipment have：
Gas turbine has the compressor of compressed air, supplies fuel from fuel feed line and make through the compressor pressure The burner of the compressed air burning of contracting and the turbine rotated by generated burning gases in the burner, and adjust The fuel trim valve of fuel feed is set to the fuel feed line；
Heat recovery boiler recycles from the heat of the exhaust of the discharge of gas turbine and generates steam；
Steam turbine is rotated by the steam generated in the heat recovery boiler；
Major steam line supplies the steam generated in the heat recovery boiler to the steam turbine；
Main steam valve is set to the major steam line, and adjusts the circulation of the steam；
Bypass line, from the major steam line branch, and with more being leaned under the flow direction of the steam than the steam turbine Swim side connection；And
By-passing valve is set to the bypass line, and adjusts the circulation of the steam,
The step of progress control method of the combined cycle equipment includes being run as follows：
Close by-pass operation, by the main steam valve be set as open state, by the aperture of the fuel trim valve be set as with it is described The corresponding aperture of desired value of total load of gas turbine and the steam turbine, the shape that the by-passing valve is set as closing State；And
Load improves and follows operation, is closed in by-pass operation described, when input improves the desired value of total load When load improves request, in the state of the main steam valve is opened, the by-passing valve is set as the state opened and waits for institute The input that load improves request is stated, increasing the fuel according to the desired value after inputting the load and improving request adjusts The aperture of valve, the state that the by-passing valve is set as closing.
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